June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 17
CHAPTER 17
Asterisk Reference
Earlier in the book, we covered compiling and installing Asterisk, installing a legacy
interface card and drivers, and setting up some simple PBX applications. Later on,
we used Asterisk configurations to illustrate some common enterprise telephony
concepts. This chapter is geared toward the person who’s comfortable with the ear-
lier material in the book and wants a deeper understanding of Asterisk.
Asterisk is a deep subject that touches disciplines of networking, code-writing, proto-
cols, and standards. This chapter won’t make you an Asterisk expert, but it should
help you go a step or two beyond the essentials we’ve already covered. We’ll cover
channel configuration—with an emphasis on Zaptel and SIP channels, dial-plan syn-
tax elements like variables and string processing, and the commands you can use in
building an Asterisk dial-plan.
How Asterisk Is Supported
Asterisk’s principal sponsor is a firm called Digium, based in the United States. The
company provides development leadership and commercial support for the open
source system. It also manufactures and distributes the Wildcard interface devices
and iAXY ATA used in some of the projects in this book. A number of independent
consultants provide commercial support for Asterisk. Subscribing ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.